What do you mean by Social Contract?
        
             
        
        
        
The sum of the first n terms in a geometric sequence given the first term (a1) and the common ratio (r) is calculated through the equation,
                            <span>Sn </span>= (<span><span><span>a1</span>(1−<span>r^n</span>) / (</span><span>1−r)
Substituting the known terms,
                           Sn = (20)(1 - (1/4)^4)) / (1 - 1/4)
                           Sn = 26.5625
Thus, the sum of the first four terms is 26.5625. </span></span>
        
             
        
        
        
The answer is -6/5 
First convert the equation to y=mx+b form 
you’ll get y=5/6x+27
then to find the line perpendicular to this equation, you have the flip the slope. 
ending with -6/5
        
             
        
        
        
Answer:
1000(1/20000) +
300(2/20000) +
10(20/20000) +
=
 
1800/20000 = .09
Step-by-step explanation:
Each ticket purchased is expected to win 9 cents
 
Each ticket purchased cost 75 cents
 
If you interpret expected winnings per ticket to include the cost then each ticket is expected to lose 66 cents. 
 
        
             
        
        
        
FC is median..
Median is a line from a vertex that equally divides the opposite side...
here FC divides DB therefore it is a median.....
HOPE IT HELPS YOU '_'